US10488625B2ActiveUtilityA1

Image capturing lens assembly, image capturing device and vehicle photographing terminal

80
Assignee: LARGAN PRECISION CO LTDPriority: Jan 17, 2014Filed: Jan 3, 2018Granted: Nov 26, 2019
Est. expiryJan 17, 2034(~7.5 yrs left)· nominal 20-yr term from priority
Inventors:Cheng-Chen LinWei-Yu Chen
H04N 23/69G02B 13/04G02B 9/62G02B 13/0045G02B 13/06G02B 13/18H04N 5/23296
80
PatentIndex Score
1
Cited by
2
References
37
Claims

Abstract

An image capturing lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element. The first lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof. The second and third lens elements have refractive power. The fourth lens element has positive refractive power. The fifth lens element with negative refractive power has an object-side surface being concave in a paraxial region thereof. The sixth lens element with refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof. The image capturing lens assembly has a total of six lens elements with refractive power.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
       1. An image capturing lens assembly comprising six lens elements, the six lens elements being, in order from an object side to an image side:
 a first lens element with negative refractive power having an image-side surface being concave in a paraxial region thereof; 
 a second lens element having an image-side surface being convex in a paraxial region thereof, wherein an absolute value of a curvature radius of an object-side surface of the second lens element is larger than an absolute value of a curvature radius of the image-side surface of the second lens element; 
 a third lens element having negative refractive power; 
 a fourth lens element; 
 a fifth lens element having an object-side surface being aspheric, wherein an absolute value of a curvature radius of the object-side surface of the fifth lens element is smaller than an absolute value of a curvature radius of an image-side surface of the fifth lens element; and 
 a sixth lens element having an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the sixth lens element has at least one inflection point in an off-axis region thereof; 
 wherein an axial distance between the image-side surface of the sixth lens element and an image plane is BL, a focal length of the image capturing lens assembly is f, and the following condition is satisfied:
     BL/f≤ 0.78. 
 
 
     
     
       2. The image capturing lens assembly of  claim 1 , wherein the second lens element has positive refractive power. 
     
     
       3. The image capturing lens assembly of  claim 1 , wherein the image-side surface of the fifth lens element is convex in a paraxial region thereof. 
     
     
       4. The image capturing lens assembly of  claim 1 , wherein a maximal field of view of the image capturing lens assembly is FOV, and the following condition is satisfied:
 120 deg.≤FOV<200 deg. 
 
     
     
       5. The image capturing lens assembly of  claim 1 , wherein the sixth lens element has negative refractive power. 
     
     
       6. The image capturing lens assembly of  claim 1 , wherein the sixth lens element has an object-side surface being convex in a paraxial region thereof. 
     
     
       7. The image capturing lens assembly of  claim 1 , wherein a curvature radius of an object-side surface of the sixth lens element is R11, a curvature radius of the image-side surface of the sixth lens element is R12, and the following condition is satisfied:
   −0.40<( R 11− R 12)/( R 11+ R 12)<0.40.
 
 
     
     
       8. The image capturing lens assembly of  claim 1 , wherein an absolute value of a curvature radius of an object-side surface of the first lens element is larger than an absolute value of a curvature radius of the image-side surface of the first lens element. 
     
     
       9. The image capturing lens assembly of  claim 1 , wherein the focal length of the image capturing lens assembly is f, a curvature radius of the image-side surface of the sixth lens element is R12, and the following condition is satisfied:
   0.25< f/R 12<1.25. 
 
     
     
       10. The image capturing lens assembly of  claim 1 , wherein a focal length of the second lens element is f2, a focal length of the third lens element is f3, and the following condition is satisfied:
   | f 2/ f 3|<2.0. 
 
     
     
       11. The image capturing lens assembly of  claim 1 , wherein at least one of the object-side surface and the image-side surface of the fifth lens element has at least one inflection point in an off-axis region thereof. 
     
     
       12. The image capturing lens assembly of  claim 1 , wherein an absolute value of a curvature radius of an object-side surface of the sixth lens element is larger than an absolute value of a curvature radius of the image-side surface of the sixth lens element. 
     
     
       13. The image capturing lens assembly of  claim 1 , wherein the fourth lens element has an object-side surface being convex in a paraxial region thereof. 
     
     
       14. The image capturing lens assembly of  claim 1 , wherein a focal length of the first lens element is f1, the curvature radius of the object-side surface of the second lens element is R3, and the following condition is satisfied:
   | f 1/ R 3|<1.4. 
 
     
     
       15. The image capturing lens assembly of  claim 1 , wherein at least three lens elements among the first through the sixth lens elements of the image capturing lens assembly are made of plastic material. 
     
     
       16. The image capturing lens assembly of  claim 1 , wherein there is a gap in a paraxial region between every adjacent lens elements of the image capturing lens assembly. 
     
     
       17. The image capturing lens assembly of  claim 1 , wherein the fourth lens element has an object-side surface and an image-side surface being both aspheric, and the image-side surface of the fifth lens element is aspheric. 
     
     
       18. An image capturing device, comprising:
 the image capturing lens assembly of  claim 1 ; and 
 an image sensor, wherein the image sensor is located on or near the image plane of the image capturing lens assembly. 
 
     
     
       19. A vehicle photographing terminal, comprising:
 the image capturing device of  claim 18 . 
 
     
     
       20. An image capturing lens assembly comprising six lens elements, the six lens elements being, in order from an object side to an image side:
 a first lens element with negative refractive power having an image-side surface being concave in a paraxial region thereof; 
 a second lens element having an image-side surface being convex in a paraxial region thereof, wherein an absolute value of a curvature radius of an object-side surface of the second lens element is larger than an absolute value of a curvature radius of the image-side surface of the second lens element; 
 a third lens element; 
 a fourth lens element; 
 a fifth lens element having an object-side surface being aspheric, wherein an absolute value of a curvature radius of the object-side surface of the fifth lens element is smaller than an absolute value of a curvature radius of an image-side surface of the fifth lens element, and at least one of the object-side surface and the image-side surface of the fifth lens element has at least one inflection point in an off-axis region thereof; and 
 a sixth lens element having an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the sixth lens element has at least one inflection point in an off-axis region thereof; 
 wherein an axial distance between the image-side surface of the sixth lens element and an image plane is BL, a focal length of the image capturing lens assembly is f, and the following condition is satisfied:
     BL/f≤ 0.78. 
 
 
     
     
       21. The image capturing lens assembly of  claim 20 , wherein the second lens element has positive refractive power. 
     
     
       22. The image capturing lens assembly of  claim 20 , wherein the image-side surface of the fifth lens element is convex in a paraxial region thereof. 
     
     
       23. The image capturing lens assembly of  claim 20 , wherein a maximal field of view of the image capturing lens assembly is FOV, and the following condition is satisfied:
   120 deg.≤FOV<200 deg.
 
 
     
     
       24. The image capturing lens assembly of  claim 20 , wherein the sixth lens element has negative refractive power. 
     
     
       25. The image capturing lens assembly of  claim 20 , wherein the sixth lens element has an object-side surface being convex in a paraxial region thereof. 
     
     
       26. The image capturing lens assembly of  claim 20 , wherein a curvature radius of an object-side surface of the sixth lens element is R11, a curvature radius of the image-side surface of the sixth lens element is R12, and the following condition is satisfied:
   −0.40<( R 11− R 12)/( R 11+ R 12)<0.40.
 
 
     
     
       27. The image capturing lens assembly of  claim 20 , wherein an absolute value of a curvature radius of an object-side surface of the first lens element is larger than an absolute value of a curvature radius of the image-side surface of the first lens element. 
     
     
       28. The image capturing lens assembly of  claim 20 , wherein the focal length of the image capturing lens assembly is f, a curvature radius of the image-side surface of the sixth lens element is R12, and the following condition is satisfied:
   0.25< f/R 12<1.25. 
 
     
     
       29. The image capturing lens assembly of  claim 20 , wherein a focal length of the second lens element is f2, a focal length of the third lens element is f3, and the following condition is satisfied:
   | f 2/ f 3|<2.0. 
 
     
     
       30. The image capturing lens assembly of  claim 20 , wherein an absolute value of a curvature radius of an object-side surface of the sixth lens element is larger than an absolute value of a curvature radius of the image-side surface of the sixth lens element. 
     
     
       31. The image capturing lens assembly of  claim 20 , wherein the fourth lens element has an object-side surface being convex in a paraxial region thereof. 
     
     
       32. The image capturing lens assembly of  claim 20 , wherein a focal length of the first lens element is f1, the curvature radius of the object-side surface of the second lens element is R3, and the following condition is satisfied:
   | f 1/ R 3|<1.4. 
 
     
     
       33. The image capturing lens assembly of  claim 20 , wherein at least three lens elements among the first through the sixth lens elements of the image capturing lens assembly are made of plastic material. 
     
     
       34. The image capturing lens assembly of  claim 20 , wherein there is a gap in a paraxial region between every adjacent lens elements of the image capturing lens assembly. 
     
     
       35. The image capturing lens assembly of  claim 20 , wherein the fourth lens element has an object-side surface and an image-side surface being both aspheric, and the image-side surface of the fifth lens element is aspheric. 
     
     
       36. An image capturing device, comprising:
 the image capturing lens assembly of  claim 20 ; and 
 an image sensor, wherein the image sensor is located on or near the image plane of the image capturing lens assembly. 
 
     
     
       37. A vehicle photographing terminal, comprising:
 the image capturing device of  claim 36 .

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